A Novel Defect Detection Method for Ferrite Shield Surface Defects by Improved Faster R-CNN

Figure 5

The structure of the bidirectional feature fusion network. The blue blocks (layers 1, 2, 3, and 4) are the feature layers extracted from ResNet-50. The yellow blocks (N1, 2, 3, and 4) are the new feature layers obtained from the top-down feature pyramid. The green blocks (feat.1, 2, 3, and 4) are the feature layers obtained from the bidirectional feature fusion network.